preference vs penchant

preference and penchant both are nouns.

Word	Noun	Adjective	Verb	Adverb
preference	Yes	No	No	No
penchant	Yes	No	No	No

As nouns, preference and penchant are synonyms defined as:

Other synonyms of preference include predilection, taste.

preference (noun)	penchant (noun)
grant of favor or advantage to one over another (especially to a country or countries in matters of international trade, such as levying duties)	a strong liking
the right or chance to choose
a predisposition in favor of something
a strong liking